Seven is the answer most English-speaking schools give: Africa, Antarctica, Asia, Australia, Europe, North America and South America. It is also not the only answer. Much of Latin America teaches six, with the Americas as one continent. Some European curricula teach six a different way, treating Eurasia as a single landmass. A few models get down to four. None of these is wrong, because a continent is a naming convention agreed by people, not a boundary you can measure with instruments.
The awkward cases are all the same case. Europe and Asia sit on one continuous plate with no water between them, so the dividing line at the Urals is a decision rather than a discovery. Panama joins the two Americas. Egypt has territory on two continents, as does Turkey, as does Russia. Any list that claims perfect tidiness is hiding something.
This site uses 6 regions: Africa, Americas, Asia, Europe, Oceania, Antarctic. That is the standard statistical grouping, which merges North and South America and puts Antarctica and the sub-Antarctic islands together. The reason is practical. It covers all 250 entries with nothing missing and nothing counted twice, which is what a browsable list needs. The seven-continent model leaves you arguing about where to file Cyprus, and does not tell you what to do with the Falkland Islands.
Between them these 6 regions hold 193 UN member states and 57 territories and dependencies, 8.14bn people, and 150,146,848km² of recorded land. The area total sits slightly above the figure usually given for Earth’s land surface, mostly because Antarctica is carried at a round 14,000,000 km² of ice sheet rather than a surveyed coastline. For the complete alphabetical version of the same data, use the A to Z list of all countries.